Modification and investigation of silica particles as a foam stabilizer

Stabilizing decontamination foam using surface-modified silica nanoparticles containing chemical reagent: foam stability, structures, and dispersion properties

“…22,23,25,26,35 Various surface treatments can be used to adjust the dispersion of the silica NPs and thus the foam stability, particularly the addition of various functional groups that promote electrostatic interactions with their surfaces. [36][37][38][39][40][41] Recently, researchers reported the enhancement of foam stability that results from modifying silica NPs with positively charged polyethylenimine 36 or enhancing their partial hydrophobicity with the addition of (CH 3 ) 2 SiCl 2 . 40 However, surface-modied silica NPs have not previously been used as stabilizers in decontamination foams.…”

The Improvement of the Quality of Construction Foam and Non-Autoclave Foam Concrete on Its Basis through the Introduction of Nanosize Additives

“…In [13] the influence of spherical monodisperse SiO 2 particles with a diameter of 20 to 700 nm on the stabilization of foam based on sodium sulfonate was investigated. The positive effect obtained in this case is shown.…”

“…The question of obtaining stable foams formed from water dispersions of laponite modified by hexylamine is considered in [14]. It is shown that such a composition "surrounds" foam bubbles with a thin layer, providing a stabilizing effect.…”

“…It is also known that the foam can be stabilized by hydrophobic polymer particles with a diameter of less than 1 μm and a length of several tens of μm [15]. The stabilization effect is connected with the formation of dense thick layers of these particles around the foam films.…”

Enhanced stability and high temperature-tolerance of CO2 foam based on a long-chain viscoelastic surfactant for CO2 foam flooding

“…One is to reduce the ability of CO 2 to permeate through foam lms, via increasing the amount of adsorbed surfactant at the foam lm by addition of some synergic agents, or via reducing the contact area of CO 2 -liquid phase by adding nanoparticles to the dispersion solutions. [19][20][21][22][23] The other is to reduce the drainage velocity of foam lm by endowing viscoelastic properties of the aqueous solution, such as adding polymers or mixture of anionic surfactants to form worm-like micelles. [24][25][26] Recently, one developed a series of CO 2 switchable wormlike micellar system fabricated by a long-chain amine-based compound in the presence of CO 2 .…”